Soil conditions and durability suitable for digging underdrain by trencher type excavator without envelope
2006
Kitagawa, I.(Hokkaido. Central Agricultural Experiment Station, Naganuma (Japan)) | Takeuchi, H. | Yokoi, Y.
Construct effects and soil conditions suitable of the low-cost digging underdrain by trencher type excavator without envelope are studied. l. The digging underdrainage requires the construction of drain hole that is 7cm wide, 40cm height in the soil depth 60 to 120cm and a hole with a diameter of 20cm, and the upper side of drain hole is closed by soil lid and filled up the digging soil. This drain hole without envelope is constructed by farm tractor with the trencher. 2. The digging underdrain that has a big hole is able to drain excess water as a pipe drainage. 3. As for durability of the digging underdrain, drain hole became a little small 7 years later in peat soil. Although 40% of drain hole decrease 10 years later. The transformation of the drain hole become remarkably 5 years later in alluvial soil. The digging underdrain was difficult to construct in diluvial soils, because the drain hole collapsed easily. Therefore the digging underdrain should be applied in a peat soil and alluvial soils, on converted upland, filed from paddy, primarily upland filed and grassland. 4. A cost of construction the digging underdrain is a little higher than a conventional mole drainage.
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